الفهرس 
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Abstract
The object of the present work is to develops high space time yeld reactor suitable for conducting solid – liquid diffusion controlled and catalytic reactions . the reactor consists of an oscillating bed of Reaching rings , the ringa are packed at random in cylindrical basket made of an insolated wire mesh (scrren) .The present study was conducted using the diffusion controlled dissolution of copper in achromate variables studied were :
1- Frequency of oscillation (I)
2- Amplitude of oscillation (A)
3- Raschig ring diameter
4- Bed height
5- Bed diameter
6- Distance between successive beds mounted on the oscillating vertical shaft
7- Effect of superimposed axial flow
8- Physical properties of the solution ( p, u, D)
The study revealed the following results
1- The mass transfer. Coefficient K increases with increasing vibration intensity ( V1 (v1 –4AI) the data fit the equation
2- K=aVi07
3- it was found that bed diameter , mash number and wire diameter of screen used in making the basket which contains the bed has a little effect of the mass transfer coefficient
4- For a given vibration extensity the mass transfer coefficient decreases generally with increasing Reshing ring diameter .
5- Study of the effect of the oscillating bed height revealed that the rate of mass transfer passes through a maximum value at a bed higher composed of two layers of Rasechingrings
6- An overial mass transfer correlation was obtained using the method of dimensional analysis the data were found in the following equation
Sh= 1.o75 Sc 033 Re v o7.